NEEDLE-TIP REPOSITIONING DURING COMPUTED-TOMOGRAPHY-GUIDED TRANSTHORACIC NEEDLE ASPIRATION BIOPSY OF SMALL DEEP PULMONARY-LESIONS - MINOR ADJUSTMENTS MAKE A BIG DIFFERENCE

The aim of the study was to determine whether a thin-gauge transthorac ic biopsy needle would be deflected from a straight path as it passed through lung tissue, and whether partially withdrawing the needle and reinserting it while applying pressure could significantly change the degree of deflection. Using a cadaver lung, we showed that the needle tip was deflected, on average, 2.5 mm from a straight path in a direct ion opposite to the bevel. The reinsertion technique using pressure ca used the average deflection to increase to 6.3 mm, a significant diffe rence from the previous value. We have found this technique to be usef ul in the performance of transthoracic needle aspiration biopsy of sma ll deep pulmonary nodules where differences in positioning of the need le tip by only a few millimeters can achieve the correct, rather than an indeterminate, diagnosis.